Types of functional powder coatings and their wide range of uses

powder coating in powder form and form a coating, solids can be up to 100%, because no solvent, so can reduce environmental pollution, save resources, and has the characteristics of recyclablefunctional powder coatings are special features that provide special purpose surface coating materialsIt can not only play the role of traditional protection and decoration, but also give materials a variety of special functions, including insulation, conductive, anti-fouling, heat, flame retardant, radiation and other functionsThe development and production of functional powder coatings in China has just started, and there is still a big gap compared with the advanced level of foreign countriesAt present, the international widely used functional powder coatings are roughly the following types:insulated powder coatings
insulated powder coatings are used for motors, electrical and electronic components of a special coating, in addition to general powder coating protection, decorative properties, at the same time have good electrical insulation performanceepoxy resin is the best raw material for the manufacture of insulated powder coatingsIt can adjust the curing speed by changing the type of curing agent, or by adding special modifiers and fillers with excellent insulation and heat resistance, and obtain a variety of coatings ranging from very soft, elastic to very hard and wear-resistant to accommodate applications under different insulation conditionsIn recent years, in addition to epoxy powder coatings, polyurethane powder coatings, polyimide powder coatings, acrylic powder coatings and so on are also being developed and usedconductive powder coating
conductive powder coating is applied to non-conductive substrate, so that it has a certain conduction current and the ability to eliminate static electricity function coatingThere are two main types of this coating: doped type and the original typedoped powder coating is an insulating polymer as the main film-forming substance, in which the conductive filler is mixed into the formation of a coatingConductive fillers are mainly metal powders, such as silver, nickel, zinc, aluminum, non-metallic powders, such as graphite, carbon black, metal oxides, such as zinc oxide, vanadium oxide, etcThe main film base is vinyl, polyester, polyamide and epoxy resinthe characteristic conductive polymer is to make the polymer itself conductive, the polymer is still in the theoretical and research stage, there is no practical application anti-corrosion powder coating
the current use of this type of coating is mainly epoxy phenolic anti-corrosion powder coating, it is based on epoxy resin and phenolic resin into a membrane substance, the two cross-link forming coating the epoxy resin used in this coating, the molecular weight of 1400, 2900 and 3570 polymer varieties are generally used Epoxy resin itself has the characteristics of adhesion, softness and anti-alkaline, and phenolic resin has excellent acid-base, solvent-resistant, heat-resistant, wet-resistant and other properties, the organic combination of the two become the ideal type of anti-corrosion material Because the reaction activity between epoxy resin and phenolic resin is weak, the film curing temperature of the coating needs to be carried out under higher conditions, and the curing temperature can be reduced by the appropriate amount of misocatalyst catalyst heat-resistant powder coating
heat-resistant powder coating refers to a powder coating that can withstand temperatures above 200 degrees C for a long time, has a good coating, and can make the protected object function normally in a high temperature environment in terms of polymer thermal stability mechanism, the thermal resistance of polymers mainly depends on its molecular structure Thus, by introducing a larger or more polar side base on the main chain, the inter-molecular interaction force is increased, thus improving the thermal stability of the polymer Another way to improve the heat resistance of powder coatings is to add heat-resistant pigments and fillers to the polymer Commonly used pigments, fillers have aluminum powder, mica powder, stainless steel powder, cadmium powder, silica and so on at present, heat-resistant powder coatings are still mainly silicone powder coatings The main direction of future research of this coating is to develop high temperature resins that can withstand higher temperatures and have good film formation and construction properties as the base material for heat-resistant coatings, as well as to study new pigments and fillers that can significantly improve the performance of substrates under high temperature conditions decorative powder coating
decorative powder coating is characterized by a beautiful and clear pattern on the surface of the coating film, giving the coating object a beautiful and colorful appearance The mechanism of pattern formation of powder coating is very different from solvent-based coating, and the pattern form of the two is also different Powder coatings mainly use their melting properties to produce texture effects, pattern form and size and formulation combination, preparation process and powder particle size have a lot to do with Synthetic resins, curing agents, leveling agents, pigments and various additives in the formulation combination are the main factors in the formation of patterns At present, the main development path sits as follows: use incompatible polymers to produce different leveling states, form three-dimensional patterns, use different curing rate curing agents, because of the difference in leveling speed to form suitable wrinkles, the use of different fillers, resulting in powder coating leveling, gloss and color differences, resulting in texture effect, the use of different particle size and different color of metal pigments, so that it is in different positions, different angles, resulting in different color differences flame retardant powder coatings polymer retardant poor, in many fields of application is limited, improve the flame retardant of polymer is very practical Flame retardant powder coating has anti-ignition, flame retardant, thermal insulation function With the rapid development of modern electronics and household appliances industry, the demand for flame retardant coatings is becoming more and more urgent At present, the main varieties of this coating is epoxy powder coating functional powder coating is a special functional material, in science and technology, national defense, industry and agriculture and many other fields play an increasingly important role At present, China's research and development of such products and foreign countries have a large gap, we must increase the development of significant functional effect, superior comprehensive performance, low cost, easy to coat functional powder coatings to meet the needs of national economic development